Cod sursa(job #1515049)

Utilizator refugiatBoni Daniel Stefan refugiat Data 1 noiembrie 2015 07:50:39
Problema Ciclu Eulerian Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.09 kb
#include<iostream>
#include<fstream>
#include<algorithm>
#include<vector>
using namespace std;
ifstream si("ciclueuler.in");
ofstream so("ciclueuler.out");
vector<int> l[100005];
vector<int> q;
int cic[500010],lg;
int main()
{
    int n,m;
    si>>n>>m;
    int i,a,b;
    for(i=0;i<m;++i)
    {
        si>>a>>b;
        l[a].push_back(b);
        l[b].push_back(a);
    }
    int imp=0;
    for(i=1;i<=n;++i)
    {
        if(l[i].size()&1)
        {
            imp=1;
            break;
        }
    }
    if(imp)
    {
        so<<-1;
    }
    else
    {
        q.push_back(1);
        int i,x;
        while(!q.empty())
        {
            a=q.back();
            if(!l[a].empty())
            {
                b=l[a].back();
                l[a].pop_back();
                l[b].erase(find(l[b].begin(),l[b].end(),a));
                q.push_back(b);
            }
            else
            {
                cic[lg++]=a;
                q.pop_back();
            }
        }
        for(i=0;i<lg-1;++i)
            so<<cic[i]<<' ';
    }
}